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LSM: Use lsmcontext in security_dentry_init_security
Replace the (secctx,seclen) pointer pair with a single lsmcontext pointer to allow return of the LSM identifier along with the context and context length. This allows security_release_secctx() to know how to release the context. Callers have been modified to use or save the returned data from the new structure. Special care is taken in the NFS code, which uses the same data structure for its own copied labels as it does for the data which comes from security_dentry_init_security(). In the case of copied labels the data has to be freed, not released. Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
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